Fourths to harry wells coffin



(No Model.)

H. J. DAVIS. ROTARY ENGINE.

Patentedy May 7, 1895.

` erica.

HENRY JACKSON DAVIS, OF, BIRMINGHAM, ALABAMA, ASSIGNOR OF THREE- FOURTHSTO HARRY WELLSOOFFIN, SAMUEL T. ECHOLS, AND GEORGE ROBERTk EARLY, OFSAME PLACE.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No.` 538,821, dated May '7,1 895.

Application tiled Tilly Z6, 1894. Serial No. 518,655. (No model.)

Z'O all wwm/ 25 may 0011007701: The inside ot' each casing is providedwith Beitknown thatLHENRYJA'oKsoN DAvIs,a a semi-circular recess B. Therecesses are citizen of the United States, residing at Birturned andfinished to form a circular cylin- 1ningham,in the countyof Jeffersonand State der when both cases `are bolted together, a 5` of Alabama,have invented certain new and space being reserved for a circular plateto 55 useful Improvements in Rotary Engines; and revolve betweenV thecasings, as hereinafter I do hereby declare thefollowing to be a full,described. T he'cylinder is provided with an clear, and exactdescription ofvthe invention, exhaust port' R placed at any desiredposisuch as will enable others skilled in the art to ltion. y to Whichitappertains to make and use the same. A main shaft C is journaled insuitable 6o My inventionvrelates to that class of steam bearingsformedin the casings. VThe shaft exengines in which a piston revolves Within atends through the casings on both sides,.and cylinderin a rotarydirection; and the objects the usual stuffing boxes having glands D. Dof my'improvement are, first, to provide an are formed on the outer endsof the shaft beari5 engine of that class of a simple and cheap conings,to secure a steam tight joint surround- 65 struction having a circularcylinder with a ciring the shaft. cular piston head attached by a plateto the A circular plate E is secured on the center main shaft the pistonhead rotating within the of the main shaft by anyof the usual methods.cylinder formed in the casings; second,to eon- On the periphery of theplate, a piston head zo struct a rotary engine having a vertical steam Fis secured as shown, or in any other desir- 7o valve, and vertical cutofi" valve inelosed in a able manner attached to the plate. The pistonsteam chest, the valves extending downward head body is formed circularand with acurve into the cylinder when the port is open'for the to fitthe cylinder formed in the casings. The admission of steam, the valvesAwhen raised by head is provided with spring packing rings G z5 therotation of' the piston head shutting the ttted'in recesses formed inthe head in the 75 steam off from'the cylinder; third,to providea usualmanner. lThe back part of the head is y rotaryenginehavingan endlesscircularcylinformed tapering the taper ending even with der in Whichacircular piston head rotates the the periphery of vthe circular plateto which head provided with packing rings to make it the head isattached. f 3o steam tight, the steam operating against the The casingson both sides near the recesses 8o head of the piston. I attain theseobjects by forming the cylinder are provided `with the the mechanismillustrated in the accompanyusual form of spring packing rings H. H to Aing drawings, in whichform asteam tight joint, between the casingsFigure l is a vertical sectional view of my and thepistou head plate. 35engine through the center. Fig. 2 is a verti- On the head of the casingsan extension for 85 cal cross-sectional view of the same through a steamchest is formed, through which thel the center. Fig.3 is avertcalcross-sectional steam is admitted to the cylinder, a steam View ot' thesteam valve through the center. pipe l being attached to the steam chestas Fig. 4 is a vertical cross-sectional view of the shown. A passage orportJleading from the 4o cut-off valve through the center. steam pipeextends across the steam chest 9o Similar letters refer to'similar partsthrough and turns downward opening. into the cylinout the several views.der. The topot the steam chestus lnclosed The casings A. A are made ofcast iron or by a cover Q the cover secured with stud othersuitablemetallic material. The casings bolts in the usual manner.

45 are provided with the usual flanges on the A circular plunger valve Khaving an ap- 95 outer edge and are secured together by bolts erture Lthrough it to admit steam is fitted in through the anges in the usualmanner. At acircular chamber formed in the steam chest.- the lower edgethe casings are provided with The said valve when down with the pointflanges turned at a right angl e, to form a base resting on the pistonhead plate, admits steam 5o on which the engine stands. through theport, and when raised by the Ico Y piston head, as shown by dottedlines, the valve closes the steam passage.

A flat cut off valve M having an aperture N through it to admit steam isfitted in grooves formed in the steam chest. The said valve when downforms a wall across the cylinder, to force the steam when admitted tofollow the piston head. The valve when raised cuts the steam off fromthe admission port, preventing the steam from entering the cylinderuntil the valve is lowered to form the wall, when steam is againadmitted to the cylinder as before described.

On the head of the valve K is fitted a bar O. The bar is attached to thevalve head by anysuitable means. Thebarextendsthrough au aperture Pformed in the steam chest, the` end of the bar resting on the head ofthecut.v oit valve M as shown. When theengine is in operation, the rotationof the `piston "head,` will tirst raise the valve K, andA afterwardraise the valve M.. The rotation of the head would rst release the valveK and allow it to drop, but it not being desirable toturn steam on untilthe c'ut off valve is lowered to place, the cut olf valve holds thesteam valve up by the bar O resting on its head, and the cut olf valve Mdescending tirst forms the cylinder wall before steam is admitted to thecylinder.

Having thusdescribed my invention, what Iclaim as new,and desire tosecure nby Letters Patent, is

l. In a rotary engine, the combination of the outer casiugs having asemicircular recess formed in each casing the recesses forming acircular cylinder when the casings are bolted together the head of thecasings forming a steam chest, an exhaust port opening from thecylinder, an inlet steam port opening tothe l cylinder, a main shaftjournaled in the casings the shaft provided with a vcircular platemounted thereon, a piston head attached to the periphery of the platethe piston head provided with rings to make a contact with the walls ofthe cylinder the head formed with a convex taper extending back from therings7 a steam valve operating in a chamber formed in the steam chestthe valve extending downward in the cylinder and formed convex on theend to make a close contact therein, a cut .O valve operating in groovesformed in the steam chest the valve extending downward in the cylinderand formed convex ou the end to make -a close contact therein, bothvalves having openings to coincide with the steam port the valvesoperated by the rotation of the piston head, substantially as and forthe purposeset forth.

2. Ina rotary engine, the combination of the `casings secured togetherforming a circular cylinder, a main shaft journaled iu the casingshaving a piston head secured thereon, a steam chest formed on the headof the casings having a steam valve, and cnt ott valve operatingtherein, a barsecured on the headot' the steam valve the bar extendingthrough an aperture formed in the steam chest, the end of the barresting on the head of the cut off valve when both valves are up, thebar preventing the descent of the steam valve untill after the descentof the cut off valve, substantially as and for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

HENRY JACKSON DAVIS.

Witnesses:

W. I-I. MANLEY, E. T. HUTcHEsoN.

